I guess the idea of being "out" a great lesson is foreign to me, as I don't
repeat lessons, and if I do, it's in a 10 year cycle (I'm on my 3rd
cycle...). Makes for a lot of "Hey! Ms. Hass, we didn't do that in our
class" from students, as they learn there are more ways to learn about art
then they thought.

I agree with all the comments about being flattered, sharing ideas, and
making the lessons your own, but what if you taught Art 4, and had the Art
1, Art 2, and Art 3 teachers constantly doing your lessons, thus causing you
to be the one to constantly have to create new lessons. I don't think it is
so much that we here on the list are arguing against sharing lessons, but
when you are in your classroom working on your lessons and another teacher
uses them, you have essentially lost a great lesson. We all have those
lessons we love to teach, and I think it would be frustrating to come up
with a great lesson idea and not be able to use it. Professional courtesy
would dictate that the "borrowing" teacher at least discuss his/her plans to
use the lesson, giving the creator of the lesson the chance to protect
his/her creative rights to the lesson. There seems to be a complete lack of
professionalism in the teacher who used the idea. These are two professional
teachers who work with the same curricular area in the same building, and it
seems that there is a breakdown in the communication lines somewhere.
~Michal